In a 1983 where the alien BETA have overrun much of the continent since invading in 1973, East Germany's elite 666th TSF Squadron, the Schwarzesmarken, dives behind enemy lines in Tactical Surface Fighters to destroy the BETA's deadliest units. Lieutenant Theodor Eberbach finds the squadron's purpose threatened from within as the Stasi maneuvers to bend the war toward East German supremacy. The arrival of Katia Waldheim, a West German officer who defects to join the unit, pushes him to fight his own state as well as the alien enemy. This entry belongs to the Muv-Luv Alternative universe.